A sterile, steerable, flexible tube containing multiple electrodes that is introduced percutaneously into the heart chambers in order to transmit electrical impulses for electrophysiological diagnostic examinations, e.g., intracardiac sensing, endocardial recording, stimulation, temporary pacing for evaluation of cardiac arrhythmias, cardioversion (CV) of electrical arrhythmias or electrophysiology (EP) mapping of cardiac structures. It is typically made of plastic with embedded electrodes often of platinum (Pt), iridium, or a composite. This is a single-use device.